Insight of evidence that some complications of diabetes mellitus due to hyperglycemia, we investigated the effect of T. arjuna bark extract on serum, liver and kidney marker enzymes in alloxan - induced diabetic rats. T. arjuna was administered orally at a doses of 250 and 500 mg/kg body weight for 30 days, after which serum liver and kidney tissues were assayed for the degree of pathological changes by means of markers such as alkaline phosphatase (ALP), acid phosphatase (ACP), alanine amino transferase (ALT), aspartate amino transferase (AST) and lactate dehydrogenase (LDH) resulted in a significant reduction in serum and tissue of liver and kidney marker enzymes when compared with control rats T. arjuna at a dose of 500 mg/kg body weight exhibited higher efficacy.